<template>
  <el-menu default-active="1-4-1" class="el-menu-vertical-demo" @open="handleOpen" @close="handleClose"
    :collapse="isCollapse" background-color="#545c64" text-color="#fff" active-text-color="#ffd04b">
    <h3>{{ isCollapse?'后台': '通用后台管理系统' }}</h3>
    <el-menu-item @click="clickMenu(item)" v-for="item in noChildren" :key="item.name" :index="item.name">
      <i :class="`el-icon-${item.icon}`"></i>
      <span slot="title">{{ item.label }}</span>
    </el-menu-item>
    <el-submenu v-for="item in hasChildren" :key="item.label" :index="item.label">
      <template slot="title">
        <i :class="`el-icon-${item.icon}`"></i>
        <span slot="title">{{ item.label }}</span>
      </template>
      <el-menu-item-group v-for="subItem in item.children" :key="subItem.path">
        <el-menu-item @click="clickMenu(subItem)" :index="subItem.path">{{ subItem.label }}</el-menu-item>
      </el-menu-item-group>
    </el-submenu>
  </el-menu>
</template>
<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}

.el-menu {
  height: 100vh;

  h3 {

    text-align: center;
    color: #fff;
    line-height: 48px;
    font-size: 16px;
    font-weight: 400;
  }
}
</style>

<script>
export default {
  data() {
    return {
      menuData: [
        {
          path: '/',
          name: 'home',
          label: '首页',
          icon: 's-home',
          url: 'Home/Home'
        },
        {
          path: '/mall',
          name: 'mall',
          label: '商品管理',
          icon: 'video-play',
          url: 'MallManage/MallManage'
        },
        {
          path: '/user',
          name: 'user',
          label: '用户管理',
          icon: 'user',
          url: 'UserManage/UserManage'
        },
        {
          label: '其他',
          icon: 'location',
          children: [
            {
              path: '/page1',
              name: 'page1',
              label: '页面1',
              icon: 'setting',
              url: 'Other/Page1'
            },
            {
              path: '/page2',
              name: 'page2',
              label: '页面2',
              icon: 'setting',
              url: 'Other/Page2'
            },
          ]
        },
      ]
    };
  },
  methods: {
    handleOpen(key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose(key, keyPath) {
      console.log(key, keyPath);
    },
    clickMenu(item) {
      //当页面的路由与跳转的路由不一致的时候跳转
      if (this.$route.path !== item.path && !(this.$route.path === '/home' && (item.path === '/'))) {
        this.$router.push(item.path);
      }
      this.$store.commit('selectMenu',item);
    }
  },
  computed: {
    //没有子菜单
    noChildren() {
      return this.menuData.filter(item => !item.children)
    },
    //有子菜单
    hasChildren() {
      return this.menuData.filter(item => item.children)
    },
    isCollapse() {
      return this.$store.state.tab.isCollapse
    }
  }
}
</script>
<style lang="less" scoped>
.el-menu {
  border-right: none;
}
</style>